I'm trying to watch .mp4 videos and listen to audio on my web browser through my main outs on my audio interface/monitors but it keeps playing through the default core audio in the mac. When I play audio files through jriver or use my midi keyboard controller though it works and sound will play through the main outs... How do I get audio generated from a web browser/videos to do the same instead of playing through the default computer?

I've tried locating output playback in the browser (doesn't exist) as well as selecting my outboard gear in midi setup and in sound preferences in the mac preferences....